I'm trying to help a family member to port from UMobile Prepaid to Hotlink Pantas Prepaid as want to have the 365 days validity

I already performed verification ID thingie on Umobile and its fine.

Followed the steps as per https://www.hotlink.com.my/en/plan/switch-to-hotlink/

However, when trying to validate the number with TAC, it keep failing and saying error.